docs: def dist_between(h,seg1,seg2):
      """
      Calculates the distance between two segments. I stole this function from
      a post by Michael Hines on the NEURON forum
      (www.neuron.yale.edu/phpbb/viewtopic.php?f=2&t=2114)
      """
      h.distance(0, seg1.x, sec=seg1.sec)
      return h.distance(seg2.x, sec=seg2.sec)